dynamic spectrum access networks

... Trang 1Coordinated Dynamic Spectrum Management ofLTE-U and Wi-Fi Networks Shweta Sagari∗, Samuel Baysting∗, Dola Saha†, Ivan Seskar∗, Wade ... radio access technologies Wi-Fi and LTE are the two most prominent access technologies being deployed today, motivating further study of the inter-system interference arising in such shared spectrum ... radio spectrum for mobile services (increase in MHz), b) deployment of small cells (increase in bits/Hz/km2), and c) efficient spectrum utilization (increase in bits/second /Hz/km2) Several spectrum

Ngày tải lên: 11/12/2016, 08:17

... Multiple-Antenna Interference Cancellation for WLAN with MAC Interference Avoidance in Open Access Networks Alexandr M Kuzminskiy 1 and Hamid Reza Karimi 1, 2 1 Alcatel-Lucent, Bell Laboratories, ... in WLAN systems such as 802.11 is investigated The medium access control (MAC) in such systems is based on carrier sensing multiple-access with collision avoidance (CSMA/CA), which itself is ... open access network (OAN) where visiting users (VUs) are allowed to share the radio resource with home users (HUs) [5] In many scenarios, VUs typically experience greater distances from an access

Ngày tải lên: 22/06/2014, 19:20

... standards for digital subscriber line (DSL) modems Dynamic spectrum management (DSM) is emerging as a key component in next-generation DSL stan-dards In DSM, spectrum is allocated adaptively in response ... Such methods are useful when a reasonable es-timate of spectrum of all users can be assumed priori How-ever, if spectrum is instead allocated dynamically, not only is this knowledge not available ... standardized for current static spectrum-management (SSM) techniques, at present no corresponding standard DSM analysis has been estab-lished This paper examines a multiuser spectrum-allocation problem

Ngày tải lên: 22/06/2014, 23:20

... login B Disallow a user from access to all resources after login C Record all access of resources and how long the user accessed each resources D Not to record any access of resources after login ... Remote Access Networks Student Guide v1.1 Page 7-20 QUESTION NO: 11 What is the default action of authentication when AAA is enabled but authentication is not set? A Allow a user to access ... Reference: Cisco Press - Building Cisco Remote Access Networks Student Guide v1.1 Page 2-25 QUESTION NO: 2 You need to support a mobile sales group who needs access to email from a variety of locations

Ngày tải lên: 06/07/2014, 01:26

... Translation in Remote Access Networks 407 Dynamic NAT Translation Screen Captures 418 Trang 21Configuring Overlapping Networks 434Chapter 11: Private Addressing and Subnetting Large Networks 457 Introduction ... providing robust and reliable methods for remote access Building Cisco Remote Access Networks (BCRAN) is a book that covers the key technology area of remote access Cisco is a dominant force in this ... 13Selecting Cisco Access Servers and Routers 14 Trang 13AS5000 Series 17Considerations Before Installing a Remote Access Network 17 Identifying Suitable Equipment for Each Site 21 Remote Access Network

Ngày tải lên: 14/08/2014, 13:20

... is used by a cellularmodem developed by Microcom No MNP level 8 exists Link Access Procedure for Modems (LAPM)Link Access Procedure for Modems (LAPM) is a protocol that provides errorcontrol ... know how youaccess the modem Asynchronous connections on a router are also calledTTY lines TTY lines are similar to the virtual type terminal (VTY) ports on a router that allow Telnet access to ... Providing Asynchronous Dial-in Terminal Services The flexibility of the Cisco access server platform is remarkable The sameaccess server can provide a multitude of dial-in, dial-out services and ser-vice

Ngày tải lên: 14/08/2014, 13:20

... betweenall of the corporate networks and all branch office networks, or a singlehost and the networks In this scenario we will secure all communicationsbetween the networks by terminating VPN ... done through the use of access lists Theseaccess lists are not like regular access lists, in that they are not used todefine which traffic is blocked or permitted—these access lists are used todefine ... be distributed across several Cisco access servers to distribute dial-inusage and simplify user access by using only a single telephone numberfor all dial-in access Such usage allows IT departments

Ngày tải lên: 14/08/2014, 13:20

... 16Router1(config)#access-list 101 permit tcp any any eq wwwRouter1(config)#access-list 101 permit tcp any any eq smtp Router1(config)#access-list 101 permit tcp any any eq pop3 Router1(config)#access-list ... Descriptionsa dynamic routing protocol) must bedefined in order for the router toknow where to send non-local traffic.Additionally, the other end musthave a route back to your network ornetworks Dynamic ... 10, but each list can have multipleentries It is important to remember to use an access list when using DDRand dynamic routing to prevent routing updates or hello packets fromopening and keeping

Ngày tải lên: 14/08/2014, 13:20

... list 101 ! access-list 101 permit tcp any any eq smtp access-list 101 permit tcp any any eq www access-list 101 permit tcp any any eq pop3 access-list 101 permit tcp any any eq telnet access-list ... (Section 8) access-list 101 permit tcp any any eq smtp access-list 101 permit tcp any any eq www access-list 101 permit tcp any any eq telnet access-list 101 permit tcp any any eq pop3 access-list ... telnet access-list 101 permit icmp any any access-list 101 deny any any The dialer list in Figure 6.10 permits only IP traffic that passes accesslist 101 Access list 101 allows only e-mail, WWW,

Ngày tải lên: 14/08/2014, 13:20

... parse 'ip access-list standard Access1#0' ok (0) Virtual-*Jul 19 04:37:23: AAA/AUTHOR: parse 'deny 10.26.2.1' ok (0) central# show ip access-lists Standard IP access list Virtual-Access1#0 ... currently can be accessed only by statically defined users associated with that interface Using virtual profiles allows a userconfiguration to be dynamically bound to an interface when it is accessed ... AAA/AUTHOR/IPCP: Virtual-Access1: Processing AV Trang 21*Jul 19 04:37:23: AAA/AUTHOR/IPCP: Virtual-Access1: done: her address 20.0.0.1, we want 20.0.0.1*Jul 19 04:37:23: AAA/AUTHOR/IPCP: Virtual-Access1: authorization

Ngày tải lên: 14/08/2014, 13:20

... running Configure remote access using the Routing andRemote Access console in the AdministrativeTools menu Select a Remote Access Server toaccess the most common remote access needs Continued Trang ... RemoteAccess console available in the Administrative Tools menu You must con-figure routing and remote access when you use a server to provide routingbetween network segments, to provide remote access ... workstations so that they can access the TerminalServices server Trang 18Figure A.31Terminal Services Client Creator.Configuring Routing and Remote Access Services Routing and remote access is configured

Ngày tải lên: 14/08/2014, 13:20

... truyền dẫn, chuyển mạch dữ liệu từ các ringAccess_router của quận, huyện. Một hướng kết nối tới Core_tỉnh, một hướng kết nối tới cácAccess_router - Lớp Access_router:  Tập trung lưu lượng, truyền ... Kết luận chương 35 Tài Liệu Tham Khảo 37 Trang 4Tổng Quan Về Các Mạng Truy Cập Quang (Optical Access Networks)Do nhu cầu băng thông cao & ít suy hao, hầu hết các mạng viễn thông ngày nay đều ... LUẬN Mạng Thông Tin Quang Thế Hệ Mới Đề tài: Tổng Quan Về Các Mạng Truy Cập Quang (Optical Access Networks) Trang 2 Hà Nội, tháng 05/2012 Contents I Mạng Quang chủ động AON (Active Optical Network)

Ngày tải lên: 16/10/2014, 23:49

... 1.2.1 Opportunistic Spectrum Access Model 4 1.2.2 Spectrum Sensing Algorithms 4 1.2.3 Spectrum Detection Techniques 5 1.2.4 Modeling of Spectrum Holes 6 1.2.5 Spectrum Sensing Model ... the efficiency inspectrum utilization Cognitive radio (CR) technology emerges as a novel solution to thespectrum under-utilization problem and addresses the exclusive spectrumaccess problem The ... current spectrum sharing model Although the exact definition of CR is still evolving, CR can be generally categorized into two operation models - opportunistic spectrum access (OSA) model and spectrum

Ngày tải lên: 27/11/2015, 12:11

... Trang 172.2Kỹ thuật đa truy nhậpĐa truy nhập dự đoán sóng mang CSMA CSMA (Carrier Sense Multiple Access) là giao thức điều khiển truy nhập phương tiện có một node để xác nhận sự vắng mặt của lưu ... trường vật lí chia sẻ như là một luồng điện hay một dải phổ điện từ CSMA/CA(carrier Sense Multiple Access / Collision Avoidance): Mỗi node phải thông báo cho các node biết mục đích truyền dẫn của ... các node khác nhận được thông báo thì thông tin được truyền đi CSMA/CD(Carrier Sense Multiple Access/ Collision Detection): Các node đang gửi có thể nhận biết khi một xung đột xuất hiện và

Ngày tải lên: 03/01/2016, 20:56

... used to provide broadband access to end users The architecture and performance of the access segment (local loop, wired and wireless access net-works, and even home networks) are getting increasing ... of access networks and how they integrate with their in-home counterparts After Athens in 2006, Ottawa in 2007, and Las Vegas in 2008, this year AccessNets moved to Asia for the first time AccessNets ... Optimally Schedule Cooperative Spectrum Sensing in Cognitive Radio Networks 133 Ke Lang, Yuan Wu, and Danny H.K Tsang Efficient Spectrum Sharing in Cognitive Radio Networks with Implicit Power

Ngày tải lên: 12/11/2019, 13:53

... Mohanty, “NeXt generation /dynamic spectrum access/ cognitive radio wireless networks: a survey,” Computer Networks, vol 50, no 13, pp 2127–2159, 2006 [3] S S C (SSC), Spectrum occupancy measurements,” ... call admission control in cellular networks, ” Wireless Networks, vol 3, no 1, pp 29–41, 1997 [11] A Ghasemi and E S Sousa, Spectrum sensing in cognitive radio networks: requirements, challenges ... access in dynamic spectrum networks, ” Physical Communication, vol 1, no 2, pp 103–111, 2008 [14] A T Hoang, Y.-C Liang, and M H Islam, “Power control and channel allocation in cognitive radio networks...

Ngày tải lên: 21/06/2014, 17:20

... static spectrum assignment approach results in an inefficient use of spectrum, and it is actually a cause of the spectrum scarcity Dynamic spectrum access (DSA) targets to im- INTRODUCTION Dynamic Spectrum ... Spectrum Access Dynamic exclusive use model Spectrum commons model Opportunistic spectrum access Figure 1.1: Categorization of DSA models prove the spectrum utilization efficiency by enabling dynamic access ... opportunistic spectrum access model This categorization is shown in Fig.1.1 1.1 Dynamic spectrum access models Next, we give a brief introduction on the spectrum access models INTRODUCTION 1.1.1 Dynamic...

Ngày tải lên: 09/09/2015, 10:19

... Policy Static Spectrum Assignment  and Exclusive Access E.g. Current  Licensed Band  Operation Dynamic Spectrum Access Public  Commons Private  Commons Coordinated Access E.g. Coexistent  Networks ... enabling technologies for dynamic spectrum access (DSA) A review of the related works on opportunistic spectrum access (OSA), virtual spectrum partitioning and complete spectrum sharing is presented ... Continuous Time Markov Chain DSA Dynamic Spectrum Access FCFS First-Come-First-Served GoS Grade-of-Service MAC Medium Access Control OSA Opportunistic Spectrum Access p.d.f Probability Density...

Ngày tải lên: 11/09/2015, 09:09

... Introduction 1.1 Spectrum Sensing Techniques 1.2 Spectrum Access Mechanisms 1.2.1 Opportunistic Spectrum Access Model 1.2.2 Spectrum Sharing ... cooperative spectrum sensing strategies accordingly 2.2 Opportunistic Spectrum Access Opportunistic spectrum access (OSA) mechanism enables SUs to sense in-band or out-of-band to exploit the access ... classified into three categories: opportunistic spectrum access (OSA) model, spectrum sharing model, and overlay model 1.2.1 Opportunistic Spectrum Access Model OSA envisioned by the DARPA XG program...

Ngày tải lên: 10/09/2015, 15:53

... Authentication using AAA for NASI www.testking.com -7- 640-605 Remote Access 3.0 Remote Access 3.0 (Building Cisco Remote Access Networks) Exam Code: 640-605 Certifications: Cisco Certified Network ... used to configure a router to access a CiscoSecure server and to use AAA; and Specifying the commands used to configure AAA on a router to control access from remote access clients Intended Audience ... type of access The capabilities of PPP give it the versatility to remain flexible, yet viable, in many situations Most remote access technology implementations center on PPP as the core access...

Ngày tải lên: 18/10/2013, 18:15